Device for generating specific electrical voltage values for consumers associated with an internal combustion engine

• US 4,435,745 A
• Filed: 03/18/1982
• Issued: 03/06/1984
• Est. Priority Date: 03/19/1981
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Eisele, Hermann, Schweizer, Hartmut, Hill, Martin
• Primary Examiner(s): SHOOP JR, WILLIAM M
• Application Number:
  US06/359,637
• Time in Patent Office: 719 Days
• Field of Search: 307/10 R, 307/10 BP, 307/24, 307/31, 307/34, 323/223, 323/282, 323/303, 363/20, 363/21, 363/59, 363/60, 363/61, 363/101
• US Class Current: 323/222
• CPC Class Codes: F02D 2041/2003 using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening
• CPC Class Codes: F02D 2041/201 by using a boost inductance
• CPC Class Codes: F02D 2041/2048 said control involving a limitation, e.g. applying current or voltage limits
• CPC Class Codes: F02D 41/20 Output circuits, e.g. for controlling currents in command coils
• CPC Class Codes: F02P 15/12 having means for strengthening spark during starting
• CPC Class Codes: H02M 3/155 using semiconductor devices only

Abstract

A device is proposed for generating specific electrical voltage values for consumers associated with an internal combustion engine. The device also encompasses a voltage elevating circuit which can be switched on in the vicinity of the minimum voltages for the consumers. This means that this voltage elevating circuit does not need to be switched on continuously during engine operation, but rather only at times of increased power needs. The voltage elevating circuit has a series circuit of a coil 20 and a diode 21 in a voltage supply line, and the connecting point of these two components is briefly closed off from the other supply line in a clocked manner. The activation of the voltage elevating circuit can be switched on and off in accordance with the input and output voltages and in accordance with the maximum permissible switching current. Depending on the clock frequency of the switch 23, the line inductance of the supply line suffices as an inductance 20.

Claims

1. A device for generating specific electrical voltage values for electrical consumers of an internal combustion engine having means to detect predetermined minimum voltages and having a voltage source and a voltage elevating circuit comprising,

an input and output voltage and includes a regulating means which has a threshold value and is connected such that the regulating means closes the switch to activate the voltage elevating circuit when the input voltage is below the threshold value, and such that the output voltage is regulated to a specific set-point value,

wherein the regulating means has a current limiting circuit with an output connected to the switch to limit current in the switch and a first comparator connected to receive the current limiting circuit output and connected to activate the switch according to the current limiting circuit output,

wherein the switch is connected to and controlled by an AND gate with an input side connected to the voltage source and the first comparator, wherein the voltage elevating circuit also includes:

a second comparator connected to receive and compare the input voltage to a reference voltage, and a third comparator connected to receive and compare the output voltage to a reference voltage, and wherein the input side of the AND gate is also connected to the second and third comparators such that the switch is controlled via the AND gate by the voltage source and the first, second and third comparators, and

wherein the voltage elevating circuit is connected to the means to detect predetermined minimum voltages to be switched on at a predetermined minimum voltage.

2. A device as defined by claim 1, wherein the inductance means in the supply line is an inductance coil.

3. A device for generating specific electrical voltage values for electrical consumers of an internal combustion engine having a means to detect predetermined minimum voltages and having a voltage source and a voltage elevating circuit comprising,

a series circuit of an inductance means and a diode in a voltage supply line connected to the consumer, and a switch having a first end connected to a second supply line and having a second end connected between the inductance means and the diode,

wherein the switch is connected to the inductance means to be controlled by an alternating voltage signal,

wherein the voltage elevating circuit includes a relay connected to the voltage source and to a first short-circuit which is connected over the diode, such that the relay short circuits the diode when the voltage source output is above a predetermined level, and

wherein the voltage elevating circuit is connected to the means to detect predetermined minimum voltages to be switched on at a predetermined minimum voltage.

4. A device for generating specific electrical voltage values for electrical consumers of an internal combustion engine having a means to detect predetermined minimum voltages and having a voltage source and a voltage elevating circuit comprising,

a series circuit of an inductance means and a diode in a voltage supply line connected to the consumer, and a switch having a first end connected to a second supply line and having a second end connected between the inductance means and the diode,

wherein the switch is connected to the inductance means to be controlled by an alternating voltage signal,

wherein the voltage elevating circuit includes a relay connected to the voltage source and to a second short circuit which is connected over the inductance means, such that the relay short circuits the inductance means when voltage source output is above a predetermined level, and

wherein the voltage elevating circuit is connected to the means to detect predetermined minimum voltages to be switched on at a predetermined minimum voltage.

5. A device for generating specific electrical voltage values for electrical consumers of an internal combustion engine having a means to detect predetermined minimum voltages and having a voltage source and a voltage elevating circuit comprising,

a series circuit of an inductance means and a diode in a voltage supply lines connected to the consumer, and a switch having a first end connected to a second supply line and having a second end connected between the inductance means and the diode,

wherein the switch is connected to the inductance means to be controlled by an alternating voltage signal, wherein the voltage elevating circuit includes a relay connected to the voltage source, and to a first short-circuit which is connected over the diode and to a second short circuit which is connected over the inductance means, such that the relay short circuits the diode and the inductance means when the voltage source output is above a predetermined level, and

wherein the voltage elevating circuit is connected to the means to detect predetermined minimum voltages to be switched on at a predetermined minimum voltage.